Mill for rolling wide bars or plates



W.' G. HOWELL. MILLFOR ROLLING WIDE BARS 0R PLATES.

(No Model.)

No. 425,880. Patented Apr. 15,1890.

UNITED STATES PATENT OFFICE.

NVILLIAM G. HOIVELL, OF PHILADELPHIA, PENNSYLVANIA.

MILL FOR ROLLING WIDE BARS OR PLATES.

SPECIFICATION forming part of Letters Patent No. 425,880, dated April 15, 1890.

Application filed September 3, 1889. Serial No. 322,834. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM G. HOWELL, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Mills for Rolling Wide Bars or Plates; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings,which form part of this specification.

My invention relates to an improvement in double reversible two-high trains for rolling iron or steel plates or sheets, &c.; and it consists in the combination of two pairs of rolls placed at diiferent elevations, but geared together, so as to revolve in opposite directions, and mechanisms for raising and lowering-the top roll of both pairs of rolls simultaneously, as will be more fully described hereinafter.

The object of my invention is to so locate the two pairs of rolls in relation to each other and gear them together that the pile is ,reduced both in its forward and return motions, thus efiecting its reduction in one-half of the the time usually employed in plate-mills.

Figure 1 represents an end view of a mill which embodies my invention. Fig. 2 is a plan view of the elevatingmechanism.

A represents the housing, in which the two pairs of rolls B O are journaled in the usual manner. Through opposite edges of the housing are made the openings or recesses D, through which the rolls are passed into position, and in which the side pieces or blocks F are placed'for the purpose of holding the boxes of the rolls in position. Each one of these side pieces is provided with the projections G, which catch in corresponding recesses in opposite edges of the openings D for the purpose of preventing the side pieces from becoming displaced from any cause. Both edges of the housing upon opposite sides of recess D are provided with ears or projections G, through which the clamping-bolts I are passed. The openings D in opposite edges of the housing give to the housing a suflicient amount of elasticity to allow the bolts I to draw the projections G sufficiently together to cause the side pieces F to be clamped in such a manner that they are held rigidly in position. When the bolts I are loosened, the side pieces F can be freely removed, and then the rolls can be removed through the openings D Without removing the mechanism for raising or lowering the top rolls.

The two pairs of rolls B O are journaled in the housing, the lower one of the rolls C being on a level with the upper one of therolls- B. These two pairs of rolls B C are geared together by the pinion J, to one end of the shaft of which the power of the engine is applied, and which revolves the pairs of rolls in opposite directions.

Passing vertically down through each end of the housing A are the two screws L N, which are provided with operating-gears O at their upper ends, and which gears mesh with the long central pinion P, to the shaft of which the operating hand-wheel Q is secured. A long pinion P is used, so as to operate the gear-wheels O in either a raised or a lowered position. The lower ends of the screws L N are made to depress the two upper rolls B C, so as to bring them nearer to their corresponding lower rolls, the amount of depression being the same on both rolls at each turn of the pinion P.

Through the lower portion of the housing are made the four grooves B, through which are passed the pins or rods S, which have their upper ends to bear against the lower corners of the boxes T of the upper rolls. The lower ends of these rods bear upon the top of the pivoted and weighted lever N, so that when the screws are turned backward the weighted lever will instantly, through the rods S, raise the upper rolls. The weight V upon the lever may either be secured thereto or be adjustable thereon; but it must be suflicient to move the boxes T upward, and thus separate the rolls.

The rolls are made to revolve in the direction of the arrows, and the pile or slab is first passed through between the two rolls B, between the two rolls C, and then over the roll X and top roll B. After the pile or slab has been once passed through both sets of rolls the wheel Qis turned,so as to depress the two top rolls B C a sufficient distance, when the pile or slab is again reduced, and this is proceeded with until the reduction is complete. As the pile is reduced in both its forward and backward movements, it will be seen that'only onehalf the time is required to accomplish the reduction that is usually required in plate mills.

Having thus described claim- 1. In a rolling-mill, the combination of two pairs of rolls and an operating-pinion placed between them, the lower roll of one pair beiug on a level with the upper roll of the other pair, substantially as shown. p

2. In a rolling-mill, the combination of a driving-pinion, two pairs of reducing-rolls placed on opposite sides thereof and made to revolve in opposite directions, mech anism for my invention, I

openings or recesses in its edges and ears or projections, withthe clamping-bolts for passing through the ears, and the removable side "pieces placed in the openings, substantially as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

. WILLIAM G. HOWELL. Witnesses:

WARREN O. STONE,

F.A. LEHMANN. 

